hey there! use your FB Account, Actually, I also had a trouble logging in with my FB account, coz I Used my Fb account for the very first time logging in on this Game. but I found another solution;
Here's the spoon!
>just go to the application FB setting (facebook.com/setting)
>Find the "Apps"...
They just not playing around guys! So just wait until it go smooth! Or rather play fair as you can't sit and wait for the modders..
Salute to @iAlex !!!!